After some problems with uvcvideo / usb under 3.13 producing non-working camera and audio, and producing a ‘tombstone’, I have reverted to 3.12.8 for the time being..    More research is needed, and I have set up a 3.13 ‘guest’ under VMware to conduct further tests, without the ‘kernel taint’ of NVIDIA drivers, etc..

[50677.696508] cannot submit urb 0, error -28: not enough bandwidth
[50713.878091] usb 9-2.7: USB disconnect, device number 9
[50713.878454] uvcvideo: Failed to resubmit video URB (-19).
[50713.910040] ------------[ cut here ]------------
[50713.910052] WARNING: CPU: 3 PID: 24169 at fs/sysfs/group.c:214 sysfs_remove_groups+0x2b/0x40()
[50713.910054] sysfs group ffffffff81559520 not found for kobject 'input9'
[50713.910055] Modules linked in: vfat fat bluetooth rfkill nvidia(PO) vmnet(O) fuse vsock(O) vmci(O) vmmon(O) rc_pinnacle_pctv_hd em28xx_rc ir_lirc_codec lirc_dev ir_sony_decoder ir_sanyo_decoder ir_rc6_decoder ir_jvc_decoder tda18271 ir_rc5_decoder ir_nec_decoder ir_mce_kbd_decoder cxd2820r rc_technisat_usb2 em28xx_dvb stv6110x em28xx uvcvideo tveeprom v4l2_common videobuf2_vmalloc videobuf2_memops iTCO_wdt iTCO_vendor_support videobuf2_core videodev media dvb_usb_technisat_usb2 stv090x usblp dvb_usb dvb_core rc_core snd_usb_audio snd_usbmidi_lib snd_hwdep snd_virtuoso snd_oxygen_lib snd_mpu401_uart snd_rawmidi microcode snd_seq snd_seq_device snd_pcm joydev ftdi_sio evdev snd_page_alloc snd_timer snd i2c_i801 soundcore i2c_core hid_logitech_dj usb_storage lpc_ich usbserial r8169 processor mii button
[50713.910104]  mfd_core nfsd auth_rpcgss oid_registry exportfs nfs_acl lockd sunrpc ipv6 autofs4 firewire_ohci firewire_core crc_itu_t ata_generic pata_acpi ehci_pci xhci_hcd ehci_hcd uhci_hcd [last unloaded: nvidia]
[50713.910120] CPU: 3 PID: 24169 Comm: GoogleTalkPlugi Tainted: P           O 3.13.0 #1
[50713.910121] Hardware name: Gigabyte Technology Co., Ltd. EP45-DS3/EP45-DS3, BIOS F5 06/18/2008
[50713.910123]  0000000000000009 ffffffff813d7f37 ffff8801b1bb1d98 ffffffff81039aed
[50713.910125]  0000000000000002 ffff8801b1bb1de8 ffff88003738ae40 ffffffff81559320
[50713.910127]  ffff88021e8471a0 ffffffff81039b57 ffffffff814afe48 0000000000000028
[50713.910130] Call Trace:
[50713.910136]  [<ffffffff813d7f37>] ? dump_stack+0x49/0x6a
[50713.910140]  [<ffffffff81039aed>] ? warn_slowpath_common+0x6d/0x90
[50713.910142]  [<ffffffff81039b57>] ? warn_slowpath_fmt+0x47/0x50
[50713.910144]  [<ffffffff8115d90b>] ? sysfs_remove_groups+0x2b/0x40
[50713.910148]  [<ffffffff812951d3>] ? device_remove_attrs+0x53/0x80
[50713.910150]  [<ffffffff81295cb6>] ? device_del+0x106/0x1a0
[50713.910153]  [<ffffffff813057d5>] ? input_unregister_device+0x45/0x80
[50713.910159]  [<ffffffffa04532d3>] ? uvc_delete+0x23/0x160 [uvcvideo]
[50713.910161]  [<ffffffff81295328>] ? device_release+0x28/0x90
[50713.910164]  [<ffffffff811e7513>] ? kobject_cleanup+0x33/0x70
[50713.910169]  [<ffffffffa03d3515>] ? v4l2_release+0x45/0x70 [videodev]
[50713.910171]  [<ffffffff810f6b0b>] ? __fput+0x8b/0x200
[50713.910175]  [<ffffffff810513bf>] ? task_work_run+0x8f/0xd0
[50713.910178]  [<ffffffff813dce72>] ? int_signal+0x12/0x17
[50713.910180] ---[ end trace b9c087fd03c19aa6 ]---

This may be a relatively trivial issue for many users, but I make frequent daily use of video conferencing, and the problems with 3.13 were a showstopper, for me..

Robert Gadsdon.   January 22, 2014.